Design Evolution and Contest Origins
George Applebay conceived the Zia for the 1982 Sailplane Homebuilders Association Homebuilt Sailplane Design Contest, but the aircraft's development proved more complex than anticipated. The design underwent six complete iterations, beginning as a canard configuration before evolving into its final twin-boom pusher layout. This extensive redesign process ultimately forced Applebay to withdraw from the competition, as contest rules prohibited design changes during the competition period. Despite missing the contest deadline, the prototype achieved first flight in 1982.
The aircraft's name honored the Zia people, reflecting the New Mexico origins of both the designer and manufacturer. When unveiled at the 1982 Oshkosh airshow in its original canard configuration, industry observers noted that the Zia "remained more of a curiosity than a force in the market place," foreshadowing its limited commercial success.
Technical Innovation
The Zia's design philosophy centered on maximizing soaring efficiency while providing reliable engine backup. Its 25:1 glide ratio rivaled pure sailplanes, achieved through meticulous attention to aerodynamic efficiency. The aircraft utilized a Wortmann FX 66-197 airfoil across its 118 square feet of wing area, generating an aspect ratio of 18:1 that contributed significantly to its exceptional performance.
Advanced materials distinguished the Zia from contemporary homebuilt aircraft. The fiberglass fuselage provided smooth surfaces crucial for laminar flow, while the carbon fiber wing spar delivered strength at minimal weight. This construction approach resulted in an empty weight of just 400 pounds against a gross weight of 650 pounds, creating favorable power-to-weight ratios.
The flap system incorporated an innovative safety feature that prevented simultaneous flap and throttle operation. The flaps deployed to 45 degrees but retracted automatically when the flap handle was released, forcing pilots to choose between powered flight and maximum lift configurations.
Engine and Performance
Power came from a single Rotax 277 two-stroke engine producing 28 horsepower, mounted in pusher configuration behind the pilot. This Austrian-manufactured engine featured manual recoil starting and drew from a four-gallon fuel tank located in the left wing root. The powerplant choice reflected the motor glider philosophy: sufficient power for takeoff and climb, with most flight time spent soaring.
The Zia's rate of sink measured just 120 feet per minute, enabling extended soaring in minimal lift conditions. Wing loading of 5.5 pounds per square foot contributed to gentle handling characteristics essential for thermal flying. Fixed tricycle landing gear with wheel pants maintained clean aerodynamics while providing conventional ground handling.
Manufacturing and Production Challenges
Applebay Inc., also known as Applebay Sailplanes, established operations in Rio Rancho, New Mexico, placing the Zia into series production during fall 1983. The company's business model offered both factory-completed aircraft and kit options to attract the homebuilder market. However, the complex construction and specialized nature of motor gliders limited market appeal.
Total production remained minimal, with only four Zias completed including the prototype. Some sources suggest only three aircraft were actually finished, highlighting the challenges faced in bringing the design to market. All examples flew under Experimental category registration, as the design never achieved type certification.
George Applebay's company produced several other aircraft models, including the GA II Chiricahua, Mescalero, and Zuni, though none achieved significant commercial success. The limited production numbers reflected both the specialized nature of motor gliders and the challenges facing small aircraft manufacturers during the 1980s economic climate.
Legacy and Current Status
By March 2011, only two Zias remained on the United States aircraft registry. George Applebay retained ownership of one example, while the other continued in private hands. A third aircraft found permanent display at the US Southwest Soaring Museum, preserving the design for future aviation enthusiasts.
The Zia's significance lies not in production numbers but in its representation of innovative thinking during the experimental aircraft movement's growth period. Its combination of advanced materials, efficient aerodynamics, and motor glider configuration demonstrated possibilities that influenced subsequent designs. The aircraft proved that small manufacturers could create technically sophisticated aircraft, even if commercial success remained elusive.
The Applebay Zia stands as testament to the creativity and technical ambition of homebuilt aircraft designers during the early 1980s. While it never achieved market success, its advanced design concepts and exceptional performance capabilities earned recognition among aviation enthusiasts who appreciated its unique contribution to motor glider development. George Applebay's innovative approach to combining sailplane efficiency with reliable engine power created an aircraft that, despite limited numbers, demonstrated the potential for advanced homebuilt designs to push technological boundaries.